I thought it was closer to 8lbs. 16oz=1lb, 32oz=1 quart, 64oz=1/2 gal, 128oz=1gal, give or take a few ounces. Im thinking there's about 120lbs, give or take, in a full tank of gas in our cars, if the tank is 15.7 as advertised. God knows, I need all the reduction I can get, I weigh...